Engineers working to tackle carcinogenic pollution from cars developed cheap and simple devices to test the effectiveness of particle filters, which could help take toxic vehicles off roads without resorting to blanket bans.

Researchers at the University of Washington (UW) have discovered a simple way, by adding polydopamine to diagnostic tests for medicine and common assays for laboratory research at a key step, to raise the accuracy of these tests.

North Korea has test launched an intercontinental ballistic missile for the first time, the United States confirmed Tuesday as it warned of an escalating threat from Pyongyang and insisted America would never accept a nuclear-armed North Korea.